Buggy code:
public abstract class BaseJMSSampler extends AbstractSampler implements TestListener { private static final long serialVersionUID = 240L ; private static final String JNDI_INITIAL_CONTEXT_FAC = "jms.initial_context_factory" ; private static final String PROVIDER_URL = "jms.provider_url" ; private static final String CONN_FACTORY = "jms.connection_factory" ; private static final String TOPIC = "jms.topic" ; private static final String PRINCIPAL = "jms.security_principle" ; private static final String CREDENTIALS = "jms.security_credentials" ; private static final String ITERATIONS = "jms.iterations" ; private static final String USE_AUTH = "jms.authenticate" ; private static final String USE_PROPERTIES_FILE = "jms.jndi_properties" ; private static final String READ_RESPONSE = "jms.read_response" ; private static final String REQUIRED = JMeterUtils . getResString ( "jms_auth_required" ) ; public BaseJMSSampler ( ) { } public SampleResult sample ( Entry e ) { } public abstract SampleResult sample ( ) { } public void setJNDIIntialContextFactory ( String icf ) { } public String getJNDIInitialContextFactory ( ) { } public void setProviderUrl ( String url ) { } public String getProviderUrl ( ) { } public void setConnectionFactory ( String factory ) { } public String getConnectionFactory ( ) { } public void setTopic ( String topic ) { } public String getTopic ( ) { } public void setUsername ( String user ) { } public String getUsername ( ) { } public void setPassword ( String pwd ) { } public String getPassword ( ) { } public void setIterations ( String count ) { } public String getIterations ( ) { } public int getIterationCount ( ) { } public void setUseAuth ( boolean useAuth ) { } public boolean isUseAuth ( ) { } public void setReadResponse ( String read ) { } public String getReadResponse ( ) { } public boolean getReadResponseAsBoolean ( ) { } public void setUseJNDIProperties ( String properties ) { } public String getUseJNDIProperties ( ) { } public boolean getUseJNDIPropertiesAsBoolean ( ) { } public static String getMessageHeaders ( Message message ) { <START_BUG> final StringBuffer response = new StringBuffer ( 256 ) ; <END_BUG> try { response . append ( "JMS<seq2seq4repair_space>Message<seq2seq4repair_space>Header<seq2seq4repair_space>Attributes:" ) ; response . append ( "\n<seq2seq4repair_space>Correlation<seq2seq4repair_space>ID:<seq2seq4repair_space>" ) ; response . append ( message . getJMSCorrelationID ( ) ) ; response . append ( "\n<seq2seq4repair_space>Delivery<seq2seq4repair_space>Mode:<seq2seq4repair_space>" ) ; if ( ( message . getJMSDeliveryMode ( ) ) == ( DeliveryMode . PERSISTENT ) ) { response . append ( "PERSISTANT" ) ; } else { response . append ( "NON-PERSISTANT" ) ; } final Destination destination = message . getJMSDestination ( ) ; response . append ( "\n<seq2seq4repair_space>Destination:<seq2seq4repair_space>" ) ; response . append ( ( destination == null ? null : destination . toString ( ) ) ) ; response . append ( "\n<seq2seq4repair_space>Expiration:<seq2seq4repair_space>" ) ; response . append ( new Date ( message . getJMSExpiration ( ) ) ) ; response . append ( "\n<seq2seq4repair_space>Message<seq2seq4repair_space>ID:<seq2seq4repair_space>" ) ; response . append ( message . getJMSMessageID ( ) ) ; response . append ( "\n<seq2seq4repair_space>Priority:<seq2seq4repair_space>" ) ; response . append ( message . getJMSPriority ( ) ) ; response . append ( "\n<seq2seq4repair_space>Redelivered:<seq2seq4repair_space>" ) ; response . append ( message . getJMSRedelivered ( ) ) ; final Destination replyTo = message . getJMSReplyTo ( ) ; response . append ( "\n<seq2seq4repair_space>Reply<seq2seq4repair_space>to:<seq2seq4repair_space>" ) ; response . append ( ( replyTo == null ? null : replyTo . toString ( ) ) ) ; response . append ( "\n<seq2seq4repair_space>Timestamp:<seq2seq4repair_space>" ) ; response . append ( new Date ( message . getJMSTimestamp ( ) ) ) ; response . append ( "\n<seq2seq4repair_space>Type:<seq2seq4repair_space>" ) ; response . append ( message . getJMSType ( ) ) ; response . append ( "\n\n" ) ; } catch ( JMSException e ) { e . printStackTrace ( ) ; } return new String ( response ) ; } }

Fix:
final StringBuilder response = new StringBuilder ( 256 ) ;